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Bazooka

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: iPaintball » Thu Sep 27, 2007 4:23 pm

Wow, this thing is beast! Is it a coaxial?
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Summer Projects:
CO2 tank hybrid: Gotta fix the meter :(
Cane gun: Needs a pilot/fill setup
1.5" piston valve gun: Almost done
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 27, 2007 4:24 pm

iPaintball wrote:Wow, this thing is beast! Is it a coaxial?


yep:

The barrel is 3/4" aluminum inside a 3" pvc pipe. The chamber is 3" pvc 14" long. The piston is spring loaded so you can load ammo first without charging, Very dangerous to charge first. I uses 110 LBS of air. The air release is in the gun handle.
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Unread postAuthor: bob-a-lu » Thu Sep 27, 2007 4:49 pm

two words BAD ASS!!
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Unread postAuthor: noob of noobs » Thu Sep 27, 2007 9:37 pm

That is truley amazing! Post damage pics! :twisted:
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Unread postAuthor: thespeedycicada » Thu Sep 27, 2007 10:14 pm

BBEEAASSTTthats amazing dude cant wait to see more of youre creations!
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: fred » Fri Sep 28, 2007 1:59 am

Sorry about the double posting MrCrowley, as I said, I,m new to this. I build and design guns. Computers are not my strong point so I,m still learning how to navigate on here. I guess my excuse is ignorance of this program.
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Wow!!!

Unread postAuthor: seudo411 » Sun Sep 30, 2007 4:14 pm

:D Okay Firstly well done on a great job, well built and presented, secondly I just have two questions,

1.) What is the travel on your piston, i.e. from sealing to firing.
2.) How are you filling ?
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Wow!!!

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Unread postAuthor: SoCalSiege » Mon Oct 01, 2007 11:21 pm

Sooo..how is it floating again?
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Unread postAuthor: fred » Tue Oct 02, 2007 2:28 am

Piston travel is 2". It is filled with an air compressor at 110lbs.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2007 2:37 am

fred wrote:Piston travel is 2"


That's far too much travel for a 3/4" barrel, all it needs to travel is 1/4 of the barrel inner diameter for maximum efficiency so in this case you cna have it 10 times smaller.
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Unread postAuthor: fred » Tue Oct 02, 2007 2:54 am

Thanks for that answer, it does seem to shoot a little weak. You always learn by listening.
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Unread postAuthor: fred » Tue Oct 02, 2007 2:58 am

I do have a question for you. I tried loading a jpeg file to the album. It said it was done, however it never came through. It was sized right, just would not download into the album.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2007 2:59 am

Modify it to 0.1875" and you'll see the difference ;)
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Bazooka layout-Piston

Unread postAuthor: fred » Tue Oct 02, 2007 11:42 am

This is the internal layout of the bazoka. I tried 5 times to add it to the album and it would not go through.
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Attachments
bazooka Layout.jpg
Piston layout
bazooka Layout.jpg

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Unread postAuthor: jackssmirkingrevenge » Tue Oct 02, 2007 11:48 am

If I could make a suggestion, remove the spring altogther (after all you're filling from behind the chamber right?) add remove everything behind the delrin ring at the rear of the piston. Add a rubber bumper to the delrin endcap and make sure that the distance between the front of the bumper and the back of the piston is a little less than 0.2 inches. You should then see a significant increase in performance.
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